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Let `f:RtoR:f(x)=x^(2)+1`. Find (i) `f^(-1){10}` (ii) `f^(-1){-3}`

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(i) `x^(2)+1=10impliesx^(2)=9impliesx=pm3`.
(ii) `x^(2)+1=-3impliesx^(3)=-4` and there is no real number whose square is -4.

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